We have legacy software running in MS-DOS 6.22 that uses an old ISA PC/4 board. The driver for the board is built into the software.
Is there a way to configure the PCI classic (for example) to emulate the way the old PC/4 communicated? The software appears to see COM1 and COM2 but not COM3 or COM4. I'm wondering if it's looking for different base addresses?